The return of measles: how a once-vanquished disease is spreading again

A year after the Texas outbreak began, new US cases reveal gaps in vaccination and rising risk for children

The measles outbreak in South Carolina now stands at 664 cases, more than doubling in a few weeks, officials said this week. The highly contagious virus has also spread onward to North Carolina, Ohio and Washington state, and similar outbreaks are unfurling in Arizona and Utah as well.

The outbreak, which first began in Texas a year ago this week, has spread to most US states – and as the US passes the one-year mark, its measles-elimination status will probably end, a symbol indicating an expected wave of year-round preventable disease. The outbreak has been plagued by misinformation, with Robert F Kennedy Jr, secretary of the US Department of Health and Human Services and longtime vaccine critic, framing measles vaccination as a personal choice and promoting unproven treatments.